Apparatus for constructing ribbed concrete floors.



A. J. WIDMiiH.

APPARATUS FOR CONSTRUCTING RIBBED CONCRETE FLOORS.

APPLICATION man DEC.1. X916,

1 238 858. Patent-edfiept. 4, 1917. F 2 SHEETSSHEET 11" A. J. WIDMER.APPARATUS FOR CONSTRUCTING RIBBED CONCRETE FLOORS.

APPLICATION FILED DEC. 1916 1,238,858. Pa-tentedSept. 4,1917.

2 SHEETSSHET 2.

172 px 17 m 17 5/4 3:5 a jh APPARATUS FOR. CONSTRUCTING RIBBED CONCRETEFLOORS.

Specification of Letters Patent.

Patented Sept. 4, 1917.

Application filed December 1, 1916. Serial No. 134,288.

7' all whom it may concern:

Be it known that I, ARTHUR J. VVIDMER, a citizen of the United States,and a resident of \Vebster Groves, in St. Louis and State ofMissouri,-have in- Vented a new and useful Improvement in Apparatus forConstructing Ribbed Concrete Floors. of which the following is aspecification.

This invention relates particularly to the centering and forms for thefloors of build ings of two or more stories in hei ht, and has for itsobjects to save lumber in the construction of the centering, and topermit the floor forms to be used repeatedly. Further objects are toarrange the centering for supporting the forms so as to expedite theerection of the centering and forms, and so as to permit easy removal ofthe forms apart from the centering, which may be left in place uutii theHour has set sufficiently to support itsell and the loads which may comeupon it.

The invention consists in arranging the joists for supporting the formsfor the ribs and panels in rows extending crosswise of the ribs andspaced about four or more feet apart, the tops of these joists beingeven with the lower edges of the ribs, and resting the ends of the formsfor the ribs and panels upon removable cleats or strips which aredetaehably secured along the Sides of the joists, the gaps over the j(.ts between the ends of the forms being filled with sheet metal shieldswhich rest upon the joists or upon the ends of the forms.

l urthcr objects and details of the invention appear in the followingdescription thereof. reference being bad to the accompanying drawings,which show the invention in several forms.

In the drawings, wherein the same reference characters designate thesame or similar parts in the several views,

Figure l is a vertical sectional view of a floor, the section beingtaken parallel to and between the ribs, the forms t'or the ribs .indpanels being shown in elevation at the lefthand side of the figure;

the county of I Fig. 2 is a top plan view of the forms shown in Fig. 1,showing them partly removed to disclose the centering beneath; Fig. 3 isa vertical floor shown in Fig. 1, transversely of the ribs, on the line3-3 in Fig. 1, looking in the direction of the arrows; 4

Fig. 4 is a similar view taken on the line in Fig. 1, looking in theopposite direction to Fig. 3;

Fig. 5 is a view like Fig. 1, showing the centering in place forsupporting the floor after the forms for the ribs and panels have beenremoved;

Fig. 6 is a vertical sectional view of a portion of a floor, the sectionbeing taken parallel to and between the ribs, showing a. modified formof centering and forms;

Fig. 7 is a transverse vertical sectional view of the same, the sectionbeing taken on the line 7-7 in Fig. 6 looking in the direction ofthearrows;

Figs. 8, 9, 10 and 11 are transverse vertical sectional views showingvarious modifications of the forms for the ribs and panels;

Figs. 12 and 13 are sectional views similar to Figs. 6 and 7,.respectively, showing another modification of the centering and meansfor supporting the forms for the ribs and floors;

Figs. 14 and 15 are sectional views similar to l igs. 12 and 13, showinga further modification of the means for supporting the forms for theribs and floors; and

igs. l6 and 17 are side views of difi'erent hangers for the cross pieceswhich support the forms for the ribs and floors, showing them in placeon the joists.

he type of floor shown in the drawings consists of a thin slab ofconcrete 20 having parallel ribs 2] on its under side for strengtheningit between the points of support, such as the wall 22 and the beam 23.The floor is molded in forms made of wood or metal which are shaped toconform to the shape of the under side of the fioor and ribs, and whichare supported on suitable centering.

sectional view of the I In the construction shown in Figs. 1 to 5,inclusive, the forms for the beams 23 are wooden troughs consisting ofbottom boards 24, side boards 25 and top boards 26, supported on crosspieces 27 which are spiked to posts 28. The posts 28 are arranged inpairs, one post of each pair on each side of the beam, and are spacedfar enough away from the sides of the beams to permit the latter to belined up on the cross pieces without diiiiculty.

The forms for the iloor and ribs consist of sollit boards :29 forsupporting the lower edges otthe ribs :21. and inverted wooden or metaltroughs 30 which have slanting sides and which tit between the ribs andconform to the sides of the ribs and under face of the lloor slab. Theadjacent ends of the troughs 30 are spaced apart, and metaL shields orhoods 31 are used for covering the gaps between them. At the ends of theribs 21 the troughs may be closed, or covered by metal hoods 31 havingtheir exposed ends closed by wooden or metal end pieces 32. The troughs30 and sol'lit boards 2!) are in short lengths of four tpet orthereabout, easy to make and to handle. and not easily broken or warpedout of shape.

The sotiit boards 25) and troughs 30 are supported at their ends oncross pieces or stringers 33 which are detach-ably secured to joists 34arranged crosswise of the ribs and supported on rows of intermediateposts 35. The nearest joists to the beam 23 are supported on the tops ofthe posts '28. The tops of the joists IH are flush with the tops of thesoltit boards 29 so as to support the under sides of the ribs 21. Thesoiiit boards and troughs are cut a trifle shorter than the spacesbetween the joist 31 to permit them to swell somewhat. The hoods 31 haveflanges 36 on the lower edges of their side walls which rest on thejoists Ill and till the gaps between the ends of the sotiit boards 29.The ends of the end hoods are closed.

The stringers 33 for carrying the ends of the sotlit boards and troughsmay be supported in any convenient manner for letting 1cm down inadvance of the joists 34. In Jigs. 1 to 5 they are shown spiked to thejoists. In Figs. 6 and 7 they are supported by cleats 37, which cleatsare spiked to the posts 3.").

The troughs 31) and softit boards 29 may be constructed in various ways.In Figs. 6 and 7 the construction is entirely of wood, even to woodenfillers 38 for bridging the gaps between the ends of the troughs. Fig. 8shows troughs made of wood and provided with lateral flanges 39 on theirlower edges to take the place of the sotiit boards. Fig. 9 shows metalsotlit ieces 40 arranged between the trough's. he sotfit pieces 40 haveedge flanges 41 for stiffening them, and by varying the width of theflanges 41 the height of the soflit boards above the stringers 33 may beadjusted to suit difl'erent depths of ribs 21 without changing the sizeof the troughs 30.

Fig. 10 shows metal troughs 42, having flanges 43 along their edges forsupporting the sottit board 29. 11 shows similar metal troughs 4.. theangcs 15 along the edges of the troughs being wide enough to meet underthe middle of the rib 21, thereby dispensing with any sofiit board.

Figs. 12 and 13 show another manner of supporting the stringers 33 topermit of their ready removal in advance of taking down the oists 3-1.The stringers are sup- :orted on brackets 46 which straddle the oists34, and hook under the stringers. The hook ends of the brackets 510 eupward away from the joists, and bloc rs 47 hold the stringers 33 at theouter upper ends of the sloping hooks. By knocking out the blocks 47,the stringers can be let down toward the joists and the forms pulleddown.

In Figs. 14 and 15, the stringers 33 are supported on wooden brackets-18 which are suspended from hangers 49 consisting of a top plateresting on the joist and two loops 50 pivoted to the top plate one oneach side ot' the joist. the lower end of each loop 50 assing under theouter lower edge of a brae ct 48 and resting in a shallow groovetherein. By swinging the loops )0 down against the joist 34 the brackets48 can be readily removed to lower the stringers 33 and forms for thefloor in advance of removing the joists 34.

Fig. 16 shows another form of hanger 51 for supporting the stringers 33,having its the joists 34 by |neans', of

hook ends sloping downwardly and support- .outer ends for preventingthem becoming separated from the brackets.

Fig? 1'. shows a metal stringer 55 of angle shape for supporting thetroughs. A wedge .36 is driven between the body portion of the hanger 57and the. vertical leg of the angle stringer to clam it against theflange 58 at the outer end 0% the hook portion.

It is evident that other modifications in the details of construction ofthe centering and forms can be made, and-theinventioa is not restricted.to the forms shown and described.

I claim the following as my invention:

1. In apparatus 'for constructing ribbed concrete floors, joistsextending crosswise of the ribs and with their tops even with the. undersides of the ribs to support them, seetions of forms for the ribsandifloor arranged between said joists with their endssupported'therefrom, the ends of said sections being spaced apartleaving gaps over said joists, and short sections separable from saidforms covering said gaps.

2. In a paratus for constructing ribbed concrete oors, joists extendingcrosswise of the ribs and with their tops even with the under side ofthe ribs to support them, stringers detachably secured alongside of said'oists, sections of forms for the ribs and oor arranged between saidjoists a. a supported on sald stringers th ends of said forms beingspaced apart leavi g ga s over said joists, and short sections separa'be from said forms covering said gaps.

3. A paratus for constructing ribbed concrete oors comprising a joistextending crosswise of the ribs, the top of the .joist supporting theunder sides of the ribs, forms arranged on each side of the joist atright angles, thereto and rejecting above the joist between the ri s,said forms being spaced apart at their ends with the joist be tweenthem, and shields arranged oveathe joist and forming continuations pfthe forms across the spaces between thcirends.

4. Apparatus for constructingzribbed'concrete floors eomprising'a joistextending cromwise beneath the ribs,- the top of the joist supportingthe under sides of the ribs, floor fmmsan'mn ed on each side of thejoist and projecting above-the jo'istbetween .the ribs, said floorform's being spaced apart at their ends with the joist between them,soiiit boards arranged beneath the ribs and spaced from the joist attheir ends. and s ields arranged over the joist and formingcontinuations of the floor forms across the spaces between their ends,said shields having portions underlying the bottoms of the ribs andresting upon the top of -the joist for bridging the spaces between theends of the soflit boards.

5. A paratus for constructing ribbed con-.

crete oors comprising a joist extending crosswise of the ribs, the topof the joist supporting the under sides of the ribs, floor formsarranged on each side of the joist and projecting above the joistbetween the ribs, stringers for supporting the ends of said floor forms,and means for removably securing said stringers to said joist, saidmeans being arranged over the joists in the spacesbetween the ribs.

6. Apparatus for constructing ribbed concrete floors comprising) lengthsof forms ar ranged in succession etween the ribs with gaps between theends of successive forms, stringers extending transversely of the ribsat said gaps, said forms being supported. Sflljd transverse stringers,and shields ranged over the stringers and forming continuations of theforms acros said gaps.

7. A paratus for eonstiucting ribbed me crete 'oors comprising a joistextending crosswise of the ribs, the top of the joist supporting theunder sides of the ribs, floor forms arran ed on each side of the joistand pro'ecting a ove the joist between the ribs, sai floor forms beinspaced apart at their ends with the joist etween them, the adjacent-endsof said floor forms being open, and hangers straddling on said joistbetween the ribs for supporting said floor forms.

8. Apparatus for constructing ribbed con crete floors comprising a joistextending crosswise of the ribs, the top of the joist supporting theunder sides of the ribs, floor forms arranged on each side of the 'joistand projecting above the joist be tween the ribs, said floor forms beingspaced apart at their ends with the joist between them, the ends of saidfloor forms being spaced from said joist, and hangers straddling saidjoist between the ribs for sup- .porting said floor forms, said hangersbeing arranged to permit 'said floor forms to be lowered with-outremoving said joist.-

9. Apparatus for constructing ribbed concrete floors comprising a joistextending crosswise of the ribs, the top of the joist supporting theunder sides of the ribs, floor forms projecting above the joist betweenthe ribs, the ends of said floor forms being clear of said joist, andhangers on said joist, said hangers carr \'ing supports for said floorforms arranged to permit said floor forms to be lowered without removingsaid joist. I i

10. Apparatus for constructing ribbed concrete floors comprising acontinuous slipporting member extending crosswise of the ribs beneaththeir under sides for supporting them, floor forms projecting above saidsupporting member and having portions extending between the ribs, theends of said floor forms being spaced apart to clear the sides of saidsupporting member, means arranged over said supporting member across thespaces between the ends of said forms for supporting the portion of thefloor over the supporting member, and means carried by said supportingmember for supporting said floor forms, said means for supporting theforms being arranged for removal independently of said supporting memberto permit the forms to be lowered without disturbing the supportingmember.

11. Apparatus for constructing ribbed concrete floors comprising formsfor the ribs arranged in sections in longitudinal alinement with gapsbetween the ends of alining sections, transverse supports for saidribeae ranged beneath them at said gaps, means at;

the ends of said sections by said transverse supports and held upshields arranged over bridging said gsps.

12. .Apparetus for concrete crosswise of the ribs at intervals,sectional f floor between the joists,

masses whereby they are the supports and constructing ribbed floorscomprising oists extending for supportlng them orms supportin the saidsections! orms having their ends free of the joists, and supports forsaid forms, said supports being supported on said joists in the spaoesbetween the ribs a'nd'being removable to permit the lowerinfg of saidsectional forms independently 0 said joists.

Signed at St. Louis, Missouri, this 29th day of November, 1916.

ARTHUR J. WIDMER.

